A peripheral - drive sludge scraper is a vital piece of equipment in sedimentation tanks, playing a significant role in wastewater treatment plants, water treatment facilities, and certain industrial processes involving solid - liquid separation.

Structure

• Drive System: It features a peripheral drive mechanism, usually installed on the outer rim of the sedimentation tank. This drive system consists of a motor, a speed - reducer, and a set of gears. The motor provides the initial power, which is then reduced in speed and increased in torque by the speed - reducer and gears. This allows for a slow and steady rotation of the entire scraper structure.

• Rotating Bridge: The rotating bridge is a long, sturdy beam that extends in a circular or semi - circular shape around the sedimentation tank. Made of high - strength steel, it provides the framework for mounting other components. The bridge is supported by rollers or wheels that run along the outer edge of the tank, ensuring smooth rotation.

• Scraper Blades: Attached to the rotating bridge at regular intervals are scraper blades. These blades are designed with a specific angle and shape to effectively scrape the sludge accumulated at the bottom of the sedimentation tank. They are typically made of wear - resistant materials such as stainless steel or high - density plastics to withstand the harsh environment of the sludge.

• Sludge Collection System: At the center or along the path of the scraper blades, there is a sludge collection trough or hopper. As the scraper blades move the sludge towards the collection point, the sludge is funneled into the trough or hopper for easy removal.

Working Principle

• The peripheral - drive mechanism initiates the rotation of the rotating bridge. As the bridge rotates slowly, the scraper blades in contact with the tank bottom move along the sedimentation tank's floor. The blades gently scrape the sludge that has settled over time towards the sludge collection area. The slow - speed rotation ensures that the sludge is not re - suspended in the water, allowing for efficient collection. Once the sludge reaches the collection trough or hopper, it can be pumped out or removed by other means for further treatment, such as sludge dewatering and disposal.

Advantages

• Large - scale Application: It is suitable for large - diameter sedimentation tanks due to its peripheral - drive design, which can cover a wide area.

• High - efficiency Sludge Removal: The evenly distributed scraper blades can effectively collect sludge from every corner of the tank bottom, ensuring thorough sludge removal.

• Stable Operation: The robust structure and well - designed drive system provide stable and reliable operation, with less vibration and longer service life.

• Low Maintenance: With relatively simple components and a straightforward mechanical design, it requires less frequent maintenance, reducing downtime and maintenance costs.